21012220221002 has 32 divisors (see below), whose sum is σ = 32790820764240. Its totient is φ = 10091140600320.

The previous prime is 21012220220989. The next prime is 21012220221011. The reversal of 21012220221002 is 20012202221012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3406567884721 + 17605652336281 = 1845689^2 + 4195909^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6083633 + ... + 8890164.

Almost surely, 2^{21012220221002} is an apocalyptic number.

21012220221002 is a deficient number, since it is larger than the sum of its proper divisors (11778600543238).

21012220221002 is a wasteful number, since it uses less digits than its factorization.

21012220221002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14974106.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21012220221002 its reverse (20012202221012), we get a palindrome (41024422442014).

The spelling of 21012220221002 in words is "twenty-one trillion, twelve billion, two hundred twenty million, two hundred twenty-one thousand, two".